Director : Gordon Douglas
Producer : David Weisbart
Written by Russell S. Hughes, Ted Sherdeman
Story by George Worthing Yates
Cinematographer : Sidney Hickox
Music : Bronislau Kaper
Costume Designer : Moss Mabry
Film Editer : Thomas Reilly
Assistant Director : Russell Saunders
Art Director : Stanley Fleischer
Make-Up : Gordon Bau
Set Decorator : G.W. Berntsen
Musical Director : Ray Heindorf
Sound : Francis J. Scheid
Orchestration : Robert Franklyn
Cast
James Whitmore (Sergeant Ben Peterson)
James Arness (Robert Graham)
Joan Weldon (Dr. Patricia Medford)
Edmund Gwenn (Dr. Harold Medford)
Onslow Stevens (Brigadier General O'Brien)
Sean McClory (Major Kibbee)
Don Shelton (Trooper Capt. Fred Edwards)
Chris Drake (Trooper Ed Blackburn)
Mary Ann Hokanson (Mrs. Thomas Lodge)
John Berardino (Patrolman Ryan, LAPD)
Dub Taylor (Railroad Yard Watchman)
Sandy Descher (The Ellison Girl)
Fess Parker (Alan Crotty)
Olin Howlin (Jensen)
William Schallert (Ambulance Attendant)
Cliff Ferre (Cliff, police lab man)
Joe Forte
Richard Bellis
Ann Doran (Child Psychiatrist)
Willis Bouchey
Marshall Bradford (Crotty's Psychiatrist)
Robert Berger
Oscar Blanke
Otis Garth (Admiral at 2nd Conference)
Richard Boyer
Waldron Boyle
Alexander Campbell
Eddie Dew
Wally Duffy
Norman Field
Dorothy Green
Kenner G. Kemp
John Maxwell
Matthew McCue
Fred Shellac
Joel Smith
Ken Smith
Janet Stewart
Harry Tyler
Harry Wilson
Russell Gaige
Leonard Nimoy (Telex operator)
Douglas Spencer (Reporter)
Dick Wessel (Railroad Detective at Boxcar)